[Webkit-unassigned] [Bug 118555] New: Do not update compositing layers when the style is forced from JavaScript

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118555

           Summary: Do not update compositing layers when the style is
                    forced from JavaScript
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: achicu at adobe.com


Some websites trigger many relayouts from JS. Each time the layout is triggered, Document::recalcStyle will call view()->updateCompositingLayersAfterStyleChange(). That happens even if we are only going to repaint only once when the JS execution is finished. However, there's no need to update the composited layers to answer questions from JS, so we could postpone it until the very last moment and compute the layers only once.

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